D
Group 177 Preventive Maintenance
W5000617
113
Check During Test Driving
Check Clutch Operation
During driving, check for smooth operation and
engagement when shifting gears. Look for uneven
engagement and/or unusual noise.
Wheel Brake Application and Release
DANGER
To do the brake test safely, make sure there are
no other vehicles within 300 yards when testing, or
perform the test in a off-road area where there is no
traffic. Performing brake test in traffic may lead to an
accident, personal injury or death.
During the first part of driving, check the wheel brakes.
Check for even application and release. Make sure the
vehicle does not pull to the side when the brakes are
applied and that the noise is not generated while braking.
Whether or not a truck is equipped with ABS brakes,
the bobtail proportioning valve will operate as designed,
regulating air brake pressure going to the rear wheel
brakes while not hooked up to a semitrailer. Rear wheels
should not lock up during moderate braking when in
bobtail mode.
Note: The rear wheels may lock intermittently while
driving unloaded under 30 km/h (20 mph) even when
equipped with ABS brakes. This is normal in unloaded
operation.
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